US3749572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for inhibiting the bleaching of photographic silver images
Assignee: Eastman Kodak Co
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Filing: 1971-11-22
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Granted: 1973-07-31
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Expires: 1991-11-22
Abstract
Abstract A PHOTOGRAPHIC PROCESS FOR INHIBITING THE BLEACHING OF PHOTOGRAPHICALLY DEVELOPED SILVER IMAGES SUCH AS SILVER SOUND TRACK IMAGES WHICH COMPRISES TREATING SUCH SILVER IMAGES WITH ALKYLAMINOALKYLENETHIOL BLEACH INHIBITORS SUCH AS THOSE HAVING THE FORMULA R1-N(-R2)-(CH2)2-SH WHEREIN R1 IS AN ALKYL GROUP OR A CYCLOALKANE GROUP AND R2 IS A HYDROGEN ATOM, A CYCLOALKANE GROUP OR AN ALKYL CARBON ATOMS AND THAT THE TOTAL NUMBER OF CARBON ATOMS IN THE BLEACH INHIBITOR MOLECULE IS 6 TO 20 AND PREFERABLY 8 TO 16.
Inventors
- 👤 R Willis
- 👤 H Wabnitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:40
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/22; G03C7/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |